Centrifugal screen.



' A. 1. HAUG. CENTRIFUGAL SCREEN.

AiPLlCATION FILED DEC. 9,1915.

Patented Dec. 19, 1916.

2 SHEETS-SHEET I.

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CENTRIFUGAL SCHEEFL.

APPLICATION man nc.9. 1915.

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V ported and hazing its ends closed by the end- BEST AVAILABLE COP I UNITED PATENT OFFICE.-

f mona. Hana, or-imsnun, nnihn'anrsnmn, nss'reno'a ro mrnovnn- PAPER .To all concern. p

Beit known that I, Aurora 'J. Hans, a

citizen of the United States, and'a resident of Nashua, county of Hillsborou h, State of New -Hampsh1re, (whose post-o ce address is care,- of Improved Paper Machinery Com pany, Nashua, New Hampshire,) have invented an Improvement in Centrifugal "Screens, ofwhlch the following description, '10.

in connection with the accom'panying'drawings, is a specification, like characters on the drawings representing: like parts.-

Thisni'nvention relates to p'ulp screens and more particularly, though. not exclusively,

to, screens of the type where stock is deliver'ed to the screening surface and forced against the same by means of'paddl blades.

the fine fibers being forced through the charged at the end thereof.

' This invention relates niore particularly, though not exclusively, to improvements in the construction of the impeller blades and their relation to the-screening surface and screen and the. coarser particles being disto' the pulp inlet orifice or orifices.

,The invention will. be best understood. by reference'to the viollowing descr ption when taken inconnection with the accompanying illustration of one specific. embodiment thereof, while its scope will be more pars Eticularly pointed out: in lthe appended --claims.

'Inthe drawings: Figure 1 is a central, longitudinal section in elevation 1 showing a pulp screen embodying one form of the invention; Fig. 2 a central, transverse section in elevation {taken on the'line 2--2- in Fig '1'; .Fig. 3 is a simllar section taken on the line 3+3 .in Fig. I; and Fig. 4 is a detail section in plan'showing the relation of the a paddle blades to a pulp inlet orifice;

-' Referring to the illustrative embodiment of the invention andmore particularly to Fig. 1, the machine there=sh0wn is provided with. a generally. drum-shaped casing 1' supcastings E -an 3. I Supported also by the end 'castings 2- and T3, and within "the casing is'a screening member-, herein in the form Perid ech unpertedji w a lie-adjacente giraafitinsiz Q. 3

mcHI'NEnY- 'oomrniw, or NASHUA, HAMPSHIRE, A. CORPORATION or h bEirrnrruoAn'soRnEnQ i n i b t ei Patented Dec. 19,1916.

Application filed Deceinber 9,1915. Seria1No.65,998. l

I the opposite end upon one of the centrally arranged castings 6 or 7 which, as Will hereafter appear, are arranged intermediate the --casing to form an annular pulp supply chamber.

The screen drum surfaces are herein stationary, although 1t is not essential (to the operation of the invention that the casing.

The pulp is discharged fromthe annular chamber 9 app-lied to the screening surface, and herein within'the screen drum, through laterally arranged discharge orifices 10 which arelocated at both sides of the annular chamber'so thatthe pulp is discharged toward each opposite end of the screen drum. At the opposite ends of the screen drum there are provided discharge openings 11 and 12-fo1- the waste, slivers or unscreened residue, the screened pulp passing through. the screeningsurface of the drum into the annular chamber-13 pr ied between the casing and the screez; trum and thence to the pulp 'discharge orifice 14 (Figs. 3 and 4;) whence it may be conductedto any desired point, I Y 7 1 1 Arranged in cooperative relation to the screening surface and l'lQIBIl'L within the screening drum, there are provided suitable means in the shapeof impeller blades 15, 15', which act both to force the stock against the screening surface and, also to feed the stock progressively along that surface. Herein there are provided two sets of such blades; one on each side of the annular pulp chamhlei'ythe' blades of one set being separated by the. blades of the other set'by a spacewhich is occupied by the pulp chamber, and the ends of the blades terminating are inclined lengthwise rearwardly with rein close proximity to the pulp discharge orifices 10. 'Herein also the bladesof each set 1 lation" to. the direction of rotationfrom the middle'of the screen toward the end'thereof, so that" as the blades are rotatedover the surface of the screemthey; tend to advance the pulp received from the discharge orifices along the screen surface, "and toward the sliver discharge outlet 1 1',"-the blades of one; setrfeeding the pulp-'greceivedby' it toward BEST AVAILABLE COP one discharge opening at the end of the screen and the blades of the other set feeding the pulp received by it in the opposite direction toward the opposite end of the screen.

The impeller blades 15 and 15 may be constructed in any desired fashion, but herein they are bolted attheir outer ends to spiders 16, 16, which latter are secured to hubs l7. 17 mounted to rotate with the impeller shaft 18. The latter is journaled in Dearings19 and 20 adapted to be driven from any suitable source of power through the driving pulley 21. At their inner ends the blades 15, 15 are given added rigidity by an a hnular connecting plate 22, 22, to which they are bolted adjacent their ends. At the'dpposite side each spider 16, 16 is provided with ribs or blades 23, 23, the ends of which act as prolongations for the blades 15, 15 and assist in expelling the slivers from the casing.

The stock is preferably fed to the inlet under a suitable head and preferably is applied to the blades so that the head or flow of the stock is utilized to assist in rotating the impeller blades. To this end the pulp discharge orifices 10 are so positioned with reference to the blades that the stock discharged therethrough is preferably fed to strike the blades at an angle near the ends thereof and preferably in a direction lengthwise the blades. The inclination of the paddle blades alone is sufiicient to give thereto an impulse of rotation as the stock discharged from the orifices 10 is forced under its head against the rear side of the blade.

Preferably, however, I also incline the orifice in the direction of rotation of the impeller blades, so that the relationship is Somewhat as shown in Fig. 4. Through this arrangement the stock discharged from the orifice strikes the rear of the paddle blade at. a considerable angle, applying thereto the impact and head of the stock supply, thereby materially assisting in the rotation of the impeller.

\l'hile I have heroin shown and described for purposes of illustrationone specific embodiment of the invention, it is to be understood that the same is not limited to the details of construction and arrangement herein shown, but that extensive deviations from the disclosure herein may be made without departing from the spirit thereof.

Claims: I i

1. In a. machine of the character described, the combination with a casing of a screen drum located therein, a stock inlet extending through the casing and the screen drum intermediate the length thereof, said inlet having a discharge opening within the screen drum, sliver discharge means at each end of 'the drum communicating with the interiorthereof, a pulp outlet communicating with the interiorof the casing, and means for feeding the stock in opposite directions toward opposite ends ofthe drum, said means comprising paddle blades inclined from end to end rearwardly with respect to the direction of rotation.

2. In a machine of the character de scribed, the combination with a casing of a screen drum located therein, a stock inlet extending through the casing intermediate the length thereof, and paddle blades cooperating with said drum and inclined from end to end rearwardly with respect to the direction of rotation whereby the unscreened materials are caused to travel fromthe stocl inlet to opposite ends of said screen drum. 3. In a machine of the character de scribed, the combination with a casing of a screen drum located therein, a stock i'nlet extending through the casing intermediate the length thereof, paddle blades cooperating with said screen drum extending in opposite directions from said stock inlet, and stock discharge openings located with reference to said blades to cause the stock to strike the latter andgive an impulse of rotation thereto.

I. In a. machine of the character described, the combination with a screen drum of rotary paddle blades mounted to (:06 erate therewith,-said blades being arran e in two sets, the blades of each set incli net from end to end with. reference to the direction of rotation from the end mt th rirun toward an' intermediate point rein, and means for feeding stock to be sore ned upon the ends of each set of blades and in the direction of their length. I

In a machine of the character described. the combination with a screen drum of rotary paddle blades mounted to cooperate therewith. said blades being arranged in two sets, the-blades ofeacli set inclined from end to end with reference to the limetion of'rotation from the end of the drum toward an intermediate point therein, and

a stock inlet located between said sets -of blades and having discharge openings for discharging stock upon. the ends of the blades-in the direction of the length thereof.

6. In a machine of the character described, the combination with a casing of a screen drum therein, two sets, of blades c0- operating with said screen drum, said sets of blades being separated by an intermediate space and a stock inlet having discharge openings in said intermediate space to discharge stock upon the ends of each set of blades.

7. In a machine of the character described, the combination with a screen drum of an impeller blade cooperating therewith, and a stock inlet having a discharge orifice inclined with relation to theaxis of rotation of said blade.

8. 111 a machine of the character described, the combination With a screen drum of an impeller blade inclined from end to end with relation to the direction of rotation, and. a stock inlet having a discharge orifice, the latter being inclined Withrelation to the axis of rotation of the blade.

9. In a machine of the character described, the combination with a casing of a screen drum, an annular pulp supply chamber intermediate the "ends of the casing, sets of impeller blades arranged on each side of said annular chamber, and discharge orifices inclined with relation to said blades for discharging pulp from said supply chamber upon the blades.

10. In a machine of the character de scribed, the combination with a screen member 4, 5, of paddle blades 15, 15, 1.6, 16, a stock supply inlet 8, a discharge passage 14-, 2e and tailings outlet 11, 12,-

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

ANTON J. HAUG. \Vitnesses SADIE E. ONEIL, MARCEL THEIRAULT. I 

